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I've got bad hole in radiator that's why I'm swapping to a new one. Before leak I was seeing normal Temps average 190 ' s figure I'll swap t-stat out be safe..
You want to end up with a 50/50 mix for most locations including Texas. If you see very low temps in winter (artic) you may want to go a bit stronger. Most bottles have a chart or other general recommendations for a proper mix.
Total cooling system capacity including the degas bottle is 27.5 qts. If you drain the radiator by the lower hose or the draincock you'll remove 1/2 the system capacity--about 14 qts. Therefore it takes 14 qts of 100% coolant added back to the system to get a 50/50 mix if you do a complete flush and fill because your starting with water in the system you'll need the concentrate to end up with a proper mix.
If you drain and refill with no flushing,what's left in the engine is 50/50 so you have to account for that.